Command Reference

ip dhcp relay information policy

To configure a Dynamic Host Configuration Protocol (DHCP) relay agent’s information reforwarding policy (what a DHCP relay agent should do if a message already contains relay information), use the ip dhcp relay information policy global configuration command. Use the no form of this command to restore the default relay information policy.

ip dhcp relay information policy {drop keep replace}

no ip dhcp relay information policy

Syntax Description

drop

Directs the DHCP relay agent to discard messages with existing relay

 

information if the relay information option is already present.

keep

Indicates that existing information is left unchanged on the DHCP

 

relay agent.

replace

Indicates that existing information is overwritten on the DHCP relay

 

agent.

Defaults

The DHCP server replaces existing relay information.

Command Modes

Global configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 12.0(1)T.

This command is used by cable modem termination systems. When a DHCP relay agent receives a message from a another DHCP relay agent, relay information might already be present in the message. By default, the relay information from the previous relay agent is replaced.

Examples

The following examples configure a DHCP relay agent to drop messages with existing relay information, keep existing information, and replace existing information:

ip dhcp relay information policy drop

ip dhcp relay information policy keep

ip dhcp relay information policy replace

Related Commands

ip dhcp relay information check ip dhcp relay information option

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Cisco Systems 32369 manual Ip dhcp relay information policy, Drop

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